The Ugly Duckling Song
I've never seen this movie before, but I've heard that Ugly Duckling song before, and no, I'm not thinking of Victor Borge.
It must have been on Captain Kangaroo and probably was.
Yes, it became quite famous. A fair number of people recorded it, including I think Bing Crosby at one point, but it was written for this film.
You might very well think that. I couldn't possibly comment.